It's Valentine's Day at Holby City (Tue, 8pm, BBC1) and reason, dignity and Ric Griffin's disposable overshoes are engulfed in an NHS sex inferno. While gurgling flibbertigibbet Chantelle aims her chest at expressionless alpha-bore Oliver Valentine ("It's Valentine's Day and your name is Oliver Valentine. Random"), Chrissie and Sacha cement their pointless romance against a backdrop of perforated bowels and subepicardial dialogue.

Less harrowing is Jo Brand On Kissing (Tue, 9pm, BBC4), in which the stand-up grumps her way through an investigation into the history, etiquette and cultural significance of smooching. While experts contribute clipboards and stats, Brand winces at lecherous bonobos in Twycross Zoo before attempting to wriggle out of a body language exercise by claiming to have herpes.

Eliciting similar whoops of ambivalence is the return of My Big Fat Gypsy Wedding (Tue, 9pm, C4) with its cheerful blend of budget haberdashery and pungent voyeurism. This week: a woman dressed as a pineapple and, because it's not filmed in London, a close-up of a horse.

While self-analysis, forgiveness and a single gunshot bring to a close the last ever episode of Big Love (Fri, 9pm, Sky Atlantic), a less clear fate awaits the subjects of Daddy Daycare (Wed, 8pm, C4), a three-part series following nine ineffectual fathers as they bumble, whimper and durr their way through a "crash course in childcare" at a variety of chaotic nurseries. One dad starts talking about vasectomies while another, overcome with exhaustion, allows bored toddlers to swarm over his lifeless body, like ants on an abandoned pasty.

Love of a more emphatic hue is explored in C4's The Wedding Proposal (Sun, 9pm), a doc that raises an eyebrow at those determined, for reasons unclear, to propose to their beloved in ways "new" and/or "unusual". Among those risking romantic rejection and public humiliation is a ski instructor keen to propose in salopettes, a sailor who uses the word "babe" as punctuation, and a civil servant who stores his engagement ring in a laundry tablet dispersal bag.